Printable Hard Sudoku

Set 1unfh2c. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
2 6 3
1 5 7 2
3 8 9 1
1 3
7 3 6 2
2 3
1 6 3
3 4 8 5
8 2 7
Hard #2
9 2 8
3 5 6 2
4 6 7 9
7 5 8
9 4 5 8
2 3
8 6 7
3 9
2 1 3 4
Hard #3
5 3
6
9 2 6 5 3 1
1 3 2 8 4
6 7
5 9
4 1 8 2 3
8 4 1
3 2 5
Hard #4
1 2 7
2 7 3 5
5 3 4
7 1 8
6 5 7 9
4 3 9
2 4 9
3 7 4
9 7 1
Hard #5
8 5 9 4 6
5 8
9 7 3 2
9 1 4 5 7
5 6
1
6 1 8 4
4 2 1
3 2 7
Hard #6
6 7 1 9
9 2 7 1
3
3
2 5 9
8 3 6 2
3 8 6
8 9 7 5 2
1 5 2 7
Hard #7
7 3 6 8 4 1
4 3 2
2 6
5 3 1
3 1
7 5 9 2 8
4 7
1 7
9 2 5 1
Hard #8
6 1 4 3
3 8
5 2
4 5 2 9
1
6 4 8 5 7
9 7
9 8 1 7 5
7 8 1 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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